Grinding and pulverizing mill.



PATENTED JULY 14, 1903.

T. BREAKELL. GRINDING AND PULVERIZING MILL.

APPLICATION FILED FEB. 13, 1902.

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UNITED STATES Patented July 14, 1903.

PATENT OFFICE.

GRINDING AND PULV ERIZING MILL.

SPECIFICATION forming part of Letters Patent No. 733,574, dated July 14, 1903.

Application filed February 13, 1902. Serial No. 93,943. (No model) To all whom it may concern.-

Be it known that I, THOMAS BREAKELL, mechanical engineer, a subject of the King of Great Britain and Ireland, residing at Brassington Hall, \Virksworth, near Derby, in the county of Derby, England, have invented an Improved Grinding and Pulverizin g Mill, (for which I have made application for Letters Patent in Great Britain, No. 18,637, and dated the 18th of September, 1901,) of which the following is a specification.

This invention relates to grinding and pulverizing millsin which the material dealt with is ground between dies on a rotating part and dies on a fixed part.

My invention consists in certain devices and combinations, which will be described in the specification and pointed out in the claim.

Referring now to the accompanying drawings, which illustrate my invention, Figure 1 is a front elevation of a grinding or pulverizing mill with the front of the casing removed. Fig. 2 is a side elevation, partly in section, of the same. Fig. 3 is a front elevation of the same, showing the screen through which the material leaves the mill. Figs. 4: and 5 show the moving and fixed dies.

1 is a casing held down on a suitable foundation by bolts 2. To the inside periphery of the casing are fixed the blocks or dies of steel 8 by means of the taper-headed bolts 9. The nuts on the bolts 9 may be run out and wood or other packing placed between the dies 8 and the casing 1 as the dies 8 are worn away through the working of the mill.

7 is a shaft which is revolved by any suit able means.

4: is a disk, preferably of cast-iron, which is fastened onto the end of the shaft 7 and revolves with it inside the casing 1. To this disk are attached the dies or shoes of steel 5 by means of the taper-headed bolts 6. The nuts on these bolts may also be run out and packing placedbetween the shoes and the rim of the disk 4:. In this way the shoes 5 and the dies 8 may be arranged to work at a greater or a less distance from each other; but in actual work I do not allow them to touch.

The sides of the casing 1 are when necessary The material to be ground is fed into the hopper 10, (water in the case of wet-grinding having been first turned on at the pipe 13.) The-material falls directly between the revolving shoes and the fixed dies 8, with the result that it is hammered and ground. When fine enough to pass the screen 16, the water passing through carries the material with it. lVhen grinding dry material, a current of air may be passed through the pipe 13 and the fine material would then be taken through the screen by the air, or the dry material may be removed by a current of air without any screen, as is at present done with other pulverizers, and settled in a chamber. My invention relates to the grinding portion of the apparatus and not to the screening of the material being ground.

The fixed dies and the moving shoes are shown in section and plan in Figs. at and 5, respectively. Both the dies and shoes may be formed of solid blocks of metal or any other suitable material, preferably hard steel, with one hole through the center for the taperheaded bolts 9 and 6, by which they are fixed to the casing 1 and disk 4, or they may be formed with a number of holes through them, as shown in Figs. 4 and 5, to give them a better grip on the material being treated, or they may be made with a number of ribs or corrugations on their wearing-surfaces, as may be desired, to treat any particular substance.

Having now described my inventio what I claim as new, and desire to secure by Letters Patent, is

In combination, the cylindrical casing,

grinding-shoes ofgradnally-increasing thick- I to the plane of said disk and perpendicular I0 ness fixed to the inner periphery of said casing I to a Vertical plane containing said shaft, suband arranged with relatively small spaces be- I stantially as described. tween adjacent shoes, ashaft adaptedtorotate i In witness whereof I have hereunto set in said casing, a disk carried by said shaft, I my hand in presence of two witnesses. grinding-shoes fixed to said disk with rela- 1 THOMAS BREAKELL. tively small spaces between adjacent shoes, Vitnesses:

a frame secured to one side of said casing and ROBERT MORRIsON NEILSON,

- a screen carried by said frame and inclined l VIVIAN ARTHUR HUGHES. 

